LG Quantum works off of a sim card, anyway the sim card based on cellphone come with sim lock to prevent if you work with other carriers. The most important thing when you want to unock your LG Quantum is IMEI number:
Find your LG Quantum IMEI Number with :
After you have your unlock code, you can being to fully unlock your LG Quantum. Simply follow the steps below and you will have your own LG Quantum unlocked to any GSM carriers. Also note, that the LG Quantum has not yet been released as of writing this guide, and as such your phone could potentially already be unlocked. However if it is not, then you will need an unlock code, as these instructions are generally used to unlock cell phones off the AT&T network.
After That Here the step to Unlock your LG Quantum phone